>> andrea mitchell remains in denver tonight. thanks. and, of course, thanks to social media, getting reaction to a debate isn't a morning-after thing anymore. it's a real time thing and the talk about the event in denver is still going on tonight. that part of our story from nbc's john yang. >> the right answer for government is to say how do we make the private sector become more efficient? >> reporter: even before they finished talking, another debate was raging online. the twitter world exploded. conservative journalist byron york, an absolutely one-sided debate. big, big win for romney. liberal comedian, bill maher. i can't believe i'm saying this, but obama looks like he does need a telepromter. analyst stu rothenberg. what happened to obama? the president didn't seem prepared. it continued on the airwaves. >> i don't know what he was doing out there. he had his head down, he was enduring the debate. rather than fighting it. >> romney supporters celebrated. >> this was awesome, from start to finish. particularly measured against fe